reuse of chemicals

Film Photography & Darkroom discussion

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gabriele turchi
Posts: 1
Joined: Sun Jul 26, 2015 1:07 am

reuse of chemicals

Postby gabriele turchi » Mon Jul 27, 2015 12:43 am

Hello All
Since i am starting developing 4x5 on paterson tanks (both color and B&W) , considering that for 4x5 processing the tank needs to be filled up ( 1 liter)
i wonder if the reuse of chemicals (both for C41 and B&W) is calculated based on how many sheets of film i have developed or how many times you filled the tank , therefore you do a cycle of processing ... for example: if i process only 1 sheet ? (i guess the first assumption is based on the fact that there is reaction between film and the chemical , reaction consume the chemicals capabilities after "enough" film have been put in contact with it ; the second assumption is based on perhaps the fact loading the chemical in the tank expose it to air , light etc... or perhaps is based on my doubts only .

also: what is the ratio between rolls and sheet of 4x5 ? (i am asking because chemicals manufactures always mention how many reels the product can process and never mention sheets )

thanks!
g


Ornello
Posts: 833
Joined: Thu Jan 19, 2006 9:49 am

Re: reuse of chemicals

Postby Ornello » Mon Jul 27, 2015 9:00 pm

gabriele turchi wrote:Hello All
Since i am starting developing 4x5 on paterson tanks (both color and B&W) , considering that for 4x5 processing the tank needs to be filled up ( 1 liter)
i wonder if the reuse of chemicals (both for C41 and B&W) is calculated based on how many sheets of film i have developed or how many times you filled the tank , therefore you do a cycle of processing ... for example: if i process only 1 sheet ? (i guess the first assumption is based on the fact that there is reaction between film and the chemical , reaction consume the chemicals capabilities after "enough" film have been put in contact with it ; the second assumption is based on perhaps the fact loading the chemical in the tank expose it to air , light etc... or perhaps is based on my doubts only .

also: what is the ratio between rolls and sheet of 4x5 ? (i am asking because chemicals manufactures always mention how many reels the product can process and never mention sheets )

thanks!
g

Your question is not clear.

Try looking here:

http://www.kodak.com/global/en/professi ... 78/j78.pdf

1 - 8x10 sheet is about equal to 1 36 exp roll.


Capacity for Replenished D-76 Developer
SIZES AVAILABLE
Sizes and CAT numbers may differ from country to country.
See your dealer who supplies KODAK PROFESSIONAL
Products.
Film Size
Number of Rolls or Sheets per
Gallon of Developer
with Replenishment
120 120
220 60
135-24 160
135-36 120
8 x 10-inch sheets 120
4 x 5-inch sheets 48


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